The differentiation between submarine habitat and submarine is a bit fussy. Ben Franklin for example was as well a submarine taking a drift dive as a habitat floating in the gulf stream.

In general a habitat is stationary while a submarine is moving around but there are several grades of mobility and range that both can have.

A habitat also focuses on submarine housing while a submarine is defined as a vehicle by its ability to travel. The units we build at concretsubmarine.com are able to provide both the cruising capacity of a yacht, combined with the housing comfort of a habitat.